Nashville, TN has a population of 643,771 and is the 25th largest city in the United States. The population density is 1,353 per sq mi which is 784% higher than the Tennessee average and 1393% higher than the national average. The median age in Nashville is 34 which is approximately 12% lower than the Tennessee average of 39. In Nashville, 46% of the population over 15 years of age are married, 83% speak English and 9% speak Spanish. 51% of Nashville residents were born in Tennessee, 35% were born out of state, 1% were born outside of the United States and 13% were foreign born.